usr.bin/netstat/if.c

   1 /*-
   2  * Copyright (c) 2013 Gleb Smirnoff <glebius@FreeBSD.org>
   3  * Copyright (c) 1983, 1988, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #if 0
  32 #ifndef lint
  33 static char sccsid[] = "@(#)if.c        8.3 (Berkeley) 4/28/95";
  34 #endif /* not lint */
  35 #endif
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include <sys/types.h>
  41 #include <sys/protosw.h>
  42 #include <sys/socket.h>
  43 #include <sys/socketvar.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/time.h>
  46
  47 #include <net/if.h>
  48 #include <net/if_dl.h>
  49 #include <net/if_types.h>
  50 #include <net/ethernet.h>
  51 #include <netinet/in.h>
  52 #include <netinet/in_var.h>
  53 #include <arpa/inet.h>
  54 #ifdef PF
  55 #include <net/pfvar.h>
  56 #include <net/if_pfsync.h>
  57 #endif
  58
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <ifaddrs.h>
  62 #include <libutil.h>
  63 #ifdef INET6
  64 #include <netdb.h>
  65 #endif
  66 #include <signal.h>
  67 #include <stdbool.h>
  68 #include <stdint.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <sysexits.h>
  73 #include <unistd.h>
  74 #include <libxo/xo.h>
  75
  76 #include "netstat.h"
  77
  78 static void sidewaysintpr(void);
  79
  80 #ifdef PF
  81 static const char* pfsyncacts[] = {
  82         /* PFSYNC_ACT_CLR */            "clear all request",
  83         /* PFSYNC_ACT_INS */            "state insert",
  84         /* PFSYNC_ACT_INS_ACK */        "state inserted ack",
  85         /* PFSYNC_ACT_UPD */            "state update",
  86         /* PFSYNC_ACT_UPD_C */          "compressed state update",
  87         /* PFSYNC_ACT_UPD_REQ */        "uncompressed state request",
  88         /* PFSYNC_ACT_DEL */            "state delete",
  89         /* PFSYNC_ACT_DEL_C */          "compressed state delete",
  90         /* PFSYNC_ACT_INS_F */          "fragment insert",
  91         /* PFSYNC_ACT_DEL_F */          "fragment delete",
  92         /* PFSYNC_ACT_BUS */            "bulk update mark",
  93         /* PFSYNC_ACT_TDB */            "TDB replay counter update",
  94         /* PFSYNC_ACT_EOF */            "end of frame mark",
  95 };
  96
  97 static const char* pfsyncacts_name[] = {
  98         /* PFSYNC_ACT_CLR */            "clear-all-request",
  99         /* PFSYNC_ACT_INS */            "state-insert",
 100         /* PFSYNC_ACT_INS_ACK */        "state-inserted-ack",
 101         /* PFSYNC_ACT_UPD */            "state-update",
 102         /* PFSYNC_ACT_UPD_C */          "compressed-state-update",
 103         /* PFSYNC_ACT_UPD_REQ */        "uncompressed-state-request",
 104         /* PFSYNC_ACT_DEL */            "state-delete",
 105         /* PFSYNC_ACT_DEL_C */          "compressed-state-delete",
 106         /* PFSYNC_ACT_INS_F */          "fragment-insert",
 107         /* PFSYNC_ACT_DEL_F */          "fragment-delete",
 108         /* PFSYNC_ACT_BUS */            "bulk-update-mark",
 109         /* PFSYNC_ACT_TDB */            "TDB-replay-counter-update",
 110         /* PFSYNC_ACT_EOF */            "end-of-frame-mark",
 111 };
 112
 113 static void
 114 pfsync_acts_stats(const char *list, const char *desc, uint64_t *a)
 115 {
 116         int i;
 117
 118         xo_open_list(list);
 119         for (i = 0; i < PFSYNC_ACT_MAX; i++, a++) {
 120                 if (*a || sflag <= 1) {
 121                         xo_open_instance(list);
 122                         xo_emit("\t\t{e:name}{:count/%ju} {N:/%s%s %s}\n",
 123                             pfsyncacts_name[i], (uintmax_t)(*a),
 124                             pfsyncacts[i], plural(*a), desc);
 125                         xo_close_instance(list);
 126                 }
 127         }
 128         xo_close_list(list);
 129 }
 130
 131 /*
 132  * Dump pfsync statistics structure.
 133  */
 134 void
 135 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 136 {
 137         struct pfsyncstats pfsyncstat, zerostat;
 138         size_t len = sizeof(struct pfsyncstats);
 139
 140         if (live) {
 141                 if (zflag)
 142                         memset(&zerostat, 0, len);
 143                 if (sysctlbyname("net.pfsync.stats", &pfsyncstat, &len,
 144                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 145                         if (errno != ENOENT)
 146                                 warn("sysctl: net.pfsync.stats");
 147                         return;
 148                 }
 149         } else
 150                 kread(off, &pfsyncstat, len);
 151
 152         xo_emit("{T:/%s}:\n", name);
 153         xo_open_container(name);
 154
 155 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 156         xo_emit(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 157
 158         p(pfsyncs_ipackets, "\t{:received-inet-packets/%ju} "
 159             "{N:/packet%s received (IPv4)}\n");
 160         p(pfsyncs_ipackets6, "\t{:received-inet6-packets/%ju} "
 161             "{N:/packet%s received (IPv6)}\n");
 162         pfsync_acts_stats("input-histogram", "received",
 163             &pfsyncstat.pfsyncs_iacts[0]);
 164         p(pfsyncs_badif, "\t\t/{:dropped-bad-interface/%ju} "
 165             "{N:/packet%s discarded for bad interface}\n");
 166         p(pfsyncs_badttl, "\t\t{:dropped-bad-ttl/%ju} "
 167             "{N:/packet%s discarded for bad ttl}\n");
 168         p(pfsyncs_hdrops, "\t\t{:dropped-short-header/%ju} "
 169             "{N:/packet%s shorter than header}\n");
 170         p(pfsyncs_badver, "\t\t{:dropped-bad-version/%ju} "
 171             "{N:/packet%s discarded for bad version}\n");
 172         p(pfsyncs_badauth, "\t\t{:dropped-bad-auth/%ju} "
 173             "{N:/packet%s discarded for bad HMAC}\n");
 174         p(pfsyncs_badact,"\t\t{:dropped-bad-action/%ju} "
 175             "{N:/packet%s discarded for bad action}\n");
 176         p(pfsyncs_badlen, "\t\t{:dropped-short/%ju} "
 177             "{N:/packet%s discarded for short packet}\n");
 178         p(pfsyncs_badval, "\t\t{:dropped-bad-values/%ju} "
 179             "{N:/state%s discarded for bad values}\n");
 180         p(pfsyncs_stale, "\t\t{:dropped-stale-state/%ju} "
 181             "{N:/stale state%s}\n");
 182         p(pfsyncs_badstate, "\t\t{:dropped-failed-lookup/%ju} "
 183             "{N:/failed state lookup\\/insert%s}\n");
 184         p(pfsyncs_opackets, "\t{:sent-inet-packets/%ju} "
 185             "{N:/packet%s sent (IPv4})\n");
 186         p(pfsyncs_opackets6, "\t{:send-inet6-packets/%ju} "
 187             "{N:/packet%s sent (IPv6})\n");
 188         pfsync_acts_stats("output-histogram", "sent",
 189             &pfsyncstat.pfsyncs_oacts[0]);
 190         p(pfsyncs_onomem, "\t\t{:discarded-no-memory/%ju} "
 191             "{N:/failure%s due to mbuf memory error}\n");
 192         p(pfsyncs_oerrors, "\t\t{:send-errors/%ju} "
 193             "{N:/send error%s}\n");
 194 #undef p
 195         xo_close_container(name);
 196 }
 197 #endif /* PF */
 198
 199 /*
 200  * Display a formatted value, or a '-' in the same space.
 201  */
 202 static void
 203 show_stat(const char *fmt, int width, const char *name,
 204     u_long value, short showvalue, int div1000)
 205 {
 206         const char *lsep, *rsep;
 207         char newfmt[64];
 208
 209         lsep = "";
 210         if (strncmp(fmt, "LS", 2) == 0) {
 211                 lsep = " ";
 212                 fmt += 2;
 213         }
 214         rsep = " ";
 215         if (strncmp(fmt, "NRS", 3) == 0) {
 216                 rsep = "";
 217                 fmt += 3;
 218         }
 219         if (showvalue == 0) {
 220                 /* Print just dash. */
 221                 xo_emit("{P:/%s}{D:/%*s}{P:/%s}", lsep, width, "-", rsep);
 222                 return;
 223         }
 224
 225         /*
 226          * XXX: workaround {P:} modifier can't be empty and doesn't seem to
 227          * take args... so we need to conditionally include it in the format.
 228          */
 229 #define maybe_pad(pad)  do {                                                \
 230         if (strlen(pad)) {                                                  \
 231                 snprintf(newfmt, sizeof(newfmt), "{P:%s}", pad);            \
 232                 xo_emit(newfmt);                                            \
 233         }                                                                   \
 234 } while (0)
 235
 236         if (hflag) {
 237                 char buf[5];
 238
 239                 /* Format in human readable form. */
 240                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 241                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL | \
 242                     ((div1000) ? HN_DIVISOR_1000 : 0));
 243                 maybe_pad(lsep);
 244                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%ds}", name, width);
 245                 xo_emit(newfmt, buf);
 246                 maybe_pad(rsep);
 247         } else {
 248                 /* Construct the format string. */
 249                 maybe_pad(lsep);
 250                 snprintf(newfmt, sizeof(newfmt), "{:%s/%%%d%s}",
 251                     name, width, fmt);
 252                 xo_emit(newfmt, value);
 253                 maybe_pad(rsep);
 254         }
 255 }
 256
 257 /*
 258  * Find next multiaddr for a given interface name.
 259  */
 260 static struct ifmaddrs *
 261 next_ifma(struct ifmaddrs *ifma, const char *name, const sa_family_t family)
 262 {
 263
 264         for(; ifma != NULL; ifma = ifma->ifma_next) {
 265                 struct sockaddr_dl *sdl;
 266
 267                 sdl = (struct sockaddr_dl *)ifma->ifma_name;
 268                 if (ifma->ifma_addr->sa_family == family &&
 269                     strcmp(sdl->sdl_data, name) == 0)
 270                         break;
 271         }
 272
 273         return (ifma);
 274 }
 275
 276 /*
 277  * Print a description of the network interfaces.
 278  */
 279 void
 280 intpr(void (*pfunc)(char *), int af)
 281 {
 282         struct ifaddrs *ifap, *ifa;
 283         struct ifmaddrs *ifmap, *ifma;
 284
 285         if (interval)
 286                 return sidewaysintpr();
 287
 288         if (getifaddrs(&ifap) != 0)
 289                 err(EX_OSERR, "getifaddrs");
 290         if (aflag && getifmaddrs(&ifmap) != 0)
 291                 err(EX_OSERR, "getifmaddrs");
 292
 293         xo_open_list("interface");
 294         if (!pfunc) {
 295                 if (Wflag)
 296                         xo_emit("{T:/%-7.7s}", "Name");
 297                 else
 298                         xo_emit("{T:/%-5.5s}", "Name");
 299                 xo_emit(" {T:/%5.5s} {T:/%-13.13s} {T:/%-17.17s} {T:/%8.8s} "
 300                     "{T:/%5.5s} {T:/%5.5s}",
 301                     "Mtu", "Network", "Address", "Ipkts", "Ierrs", "Idrop");
 302                 if (bflag)
 303                         xo_emit(" {T:/%10.10s}","Ibytes");
 304                 xo_emit(" {T:/%8.8s} {T:/%5.5s}", "Opkts", "Oerrs");
 305                 if (bflag)
 306                         xo_emit(" {T:/%10.10s}","Obytes");
 307                 xo_emit(" {T:/%5s}", "Coll");
 308                 if (dflag)
 309                         xo_emit(" {T:/%s}", "Drop");
 310                 xo_emit("\n");
 311         }
 312
 313         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 314                 bool network = false, link = false;
 315                 char *name, *xname, buf[IFNAMSIZ+1];
 316
 317                 if (interface != NULL && strcmp(ifa->ifa_name, interface) != 0)
 318                         continue;
 319
 320                 name = ifa->ifa_name;
 321
 322                 if (pfunc) {
 323
 324                         (*pfunc)(name);
 325
 326                         /*
 327                          * Skip all ifaddrs belonging to same interface.
 328                          */
 329                         while(ifa->ifa_next != NULL &&
 330                             (strcmp(ifa->ifa_next->ifa_name, name) == 0)) {
 331                                 ifa = ifa->ifa_next;
 332                         }
 333                         continue;
 334                 }
 335
 336                 if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 337                         continue;
 338
 339                 xo_open_instance("interface");
 340
 341                 if ((ifa->ifa_flags & IFF_UP) == 0) {
 342                         xname = stpcpy(buf, name);
 343                         *xname++ = '*';
 344                         *xname = '\0';
 345                         xname = buf;
 346                 } else
 347                         xname = name;
 348
 349                 if (Wflag)
 350                         xo_emit("{etk:name/%s}{e:flags/0x%x}{d:/%7.7s}",
 351                             name, ifa->ifa_flags, xname);
 352                 else
 353                         xo_emit("{etk:name/%s}{e:flags/0x%x}{d:/%5.5s}",
 354                             name, ifa->ifa_flags, xname);
 355
 356 #define IFA_MTU(ifa)    (((struct if_data *)(ifa)->ifa_data)->ifi_mtu)
 357                 show_stat("lu", 6, "mtu", IFA_MTU(ifa), IFA_MTU(ifa), 0);
 358 #undef IFA_MTU
 359
 360                 switch (ifa->ifa_addr->sa_family) {
 361                 case AF_UNSPEC:
 362                         xo_emit("{:network/%-13.13s} ", "none");
 363                         xo_emit("{:address/%-15.15s} ", "none");
 364                         break;
 365                 case AF_INET:
 366                         if (Wflag) {
 367                                 xo_emit("{t:network/%-13s} ",
 368                                     netname(ifa->ifa_addr, ifa->ifa_netmask));
 369                                 xo_emit("{t:address/%-17s} ",
 370                                     routename(ifa->ifa_addr, numeric_addr));
 371                         } else {
 372                                 xo_emit("{t:network/%-13.13s} ",
 373                                     netname(ifa->ifa_addr, ifa->ifa_netmask));
 374                                 xo_emit("{t:address/%-17.17s} ",
 375                                     routename(ifa->ifa_addr, numeric_addr));
 376                         }
 377
 378                         network = true;
 379                         break;
 380 #ifdef INET6
 381                 case AF_INET6:
 382                         if (Wflag) {
 383                                 xo_emit("{t:network/%-13s} ",
 384                                     netname(ifa->ifa_addr, ifa->ifa_netmask));
 385                                 xo_emit("{t:address/%-17s} ",
 386                                     routename(ifa->ifa_addr, numeric_addr));
 387                         } else {
 388                                 xo_emit("{t:network/%-13.13s} ",
 389                                     netname(ifa->ifa_addr, ifa->ifa_netmask));
 390                                 xo_emit("{t:address/%-17.17s} ",
 391                                     routename(ifa->ifa_addr, numeric_addr));
 392                         }
 393
 394                         network = true;
 395                         break;
 396 #endif /* INET6 */
 397                 case AF_LINK:
 398                     {
 399                         struct sockaddr_dl *sdl;
 400                         char linknum[10];
 401
 402                         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 403                         sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 404                         xo_emit("{t:network/%-13.13s} ", linknum);
 405                         if (sdl->sdl_nlen == 0 &&
 406                             sdl->sdl_alen == 0 &&
 407                             sdl->sdl_slen == 0)
 408                                 xo_emit("{P:                  }");
 409                         else
 410                                 xo_emit("{:address/%*s}",
 411                                     32 - 3 * sdl->sdl_alen,
 412                                     routename(ifa->ifa_addr, 1));
 413                         link = true;
 414                         break;
 415                     }
 416                 }
 417
 418 #define IFA_STAT(s)     (((struct if_data *)ifa->ifa_data)->ifi_ ## s)
 419                 show_stat("lu", 8, "received-packets", IFA_STAT(ipackets),
 420                     link|network, 1);
 421                 show_stat("lu", 5, "received-errors", IFA_STAT(ierrors),
 422                     link, 1);
 423                 show_stat("lu", 5, "dropped-packets", IFA_STAT(iqdrops),
 424                     link, 1);
 425                 if (bflag)
 426                         show_stat("lu", 10, "received-bytes", IFA_STAT(ibytes),
 427                             link|network, 0);
 428                 show_stat("lu", 8, "sent-packets", IFA_STAT(opackets),
 429                     link|network, 1);
 430                 show_stat("lu", 5, "send-errors", IFA_STAT(oerrors), link, 1);
 431                 if (bflag)
 432                         show_stat("lu", 10, "sent-bytes", IFA_STAT(obytes),
 433                             link|network, 0);
 434                 show_stat("NRSlu", 5, "collisions", IFA_STAT(collisions),
 435                     link, 1);
 436                 if (dflag)
 437                         show_stat("LSlu", 5, "dropped-packets",
 438                             IFA_STAT(oqdrops), link, 1);
 439                 xo_emit("\n");
 440
 441                 if (!aflag) {
 442                         xo_close_instance("interface");
 443                         continue;
 444                 }
 445
 446                 /*
 447                  * Print family's multicast addresses.
 448                  */
 449                 xo_open_list("multicast-address");
 450                 for (ifma = next_ifma(ifmap, ifa->ifa_name,
 451                     ifa->ifa_addr->sa_family);
 452                     ifma != NULL;
 453                     ifma = next_ifma(ifma, ifa->ifa_name,
 454                     ifa->ifa_addr->sa_family)) {
 455                         const char *fmt = NULL;
 456
 457                         xo_open_instance("multicast-address");
 458                         switch (ifma->ifma_addr->sa_family) {
 459                         case AF_LINK:
 460                             {
 461                                 struct sockaddr_dl *sdl;
 462
 463                                 sdl = (struct sockaddr_dl *)ifma->ifma_addr;
 464                                 if (sdl->sdl_type != IFT_ETHER &&
 465                                     sdl->sdl_type != IFT_FDDI)
 466                                         break;
 467                             }
 468                                 /* FALLTHROUGH */
 469                         case AF_INET:
 470 #ifdef INET6
 471                         case AF_INET6:
 472 #endif /* INET6 */
 473                                 fmt = routename(ifma->ifma_addr, numeric_addr);
 474                                 break;
 475                         }
 476                         if (fmt) {
 477                                 if (Wflag)
 478                                         xo_emit("{P:/%27s }"
 479                                             "{t:address/%-17s/}", "", fmt);
 480                                 else
 481                                         xo_emit("{P:/%25s }"
 482                                             "{t:address/%-17.17s/}", "", fmt);
 483                                 if (ifma->ifma_addr->sa_family == AF_LINK) {
 484                                         xo_emit(" {:received-packets/%8lu}",
 485                                             IFA_STAT(imcasts));
 486                                         xo_emit("{P:/%*s}", bflag? 17 : 6, "");
 487                                         xo_emit(" {:sent-packets/%8lu}",
 488                                             IFA_STAT(omcasts));
 489                                 }
 490                                 xo_emit("\n");
 491                         }
 492                         xo_close_instance("multicast-address");
 493                         ifma = ifma->ifma_next;
 494                 }
 495                 xo_close_list("multicast-address");
 496                 xo_close_instance("interface");
 497         }
 498         xo_close_list("interface");
 499
 500         freeifaddrs(ifap);
 501         if (aflag)
 502                 freeifmaddrs(ifmap);
 503 }
 504
 505 struct iftot {
 506         u_long  ift_ip;                 /* input packets */
 507         u_long  ift_ie;                 /* input errors */
 508         u_long  ift_id;                 /* input drops */
 509         u_long  ift_op;                 /* output packets */
 510         u_long  ift_oe;                 /* output errors */
 511         u_long  ift_od;                 /* output drops */
 512         u_long  ift_co;                 /* collisions */
 513         u_long  ift_ib;                 /* input bytes */
 514         u_long  ift_ob;                 /* output bytes */
 515 };
 516
 517 /*
 518  * Obtain stats for interface(s).
 519  */
 520 static void
 521 fill_iftot(struct iftot *st)
 522 {
 523         struct ifaddrs *ifap, *ifa;
 524         bool found = false;
 525
 526         if (getifaddrs(&ifap) != 0)
 527                 xo_err(EX_OSERR, "getifaddrs");
 528
 529         bzero(st, sizeof(*st));
 530
 531         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 532                 if (ifa->ifa_addr->sa_family != AF_LINK)
 533                         continue;
 534                 if (interface) {
 535                         if (strcmp(ifa->ifa_name, interface) == 0)
 536                                 found = true;
 537                         else
 538                                 continue;
 539                 }
 540
 541                 st->ift_ip += IFA_STAT(ipackets);
 542                 st->ift_ie += IFA_STAT(ierrors);
 543                 st->ift_id += IFA_STAT(iqdrops);
 544                 st->ift_ib += IFA_STAT(ibytes);
 545                 st->ift_op += IFA_STAT(opackets);
 546                 st->ift_oe += IFA_STAT(oerrors);
 547                 st->ift_od += IFA_STAT(oqdrops);
 548                 st->ift_ob += IFA_STAT(obytes);
 549                 st->ift_co += IFA_STAT(collisions);
 550         }
 551
 552         if (interface && found == false)
 553                 xo_err(EX_DATAERR, "interface %s not found", interface);
 554
 555         freeifaddrs(ifap);
 556 }
 557
 558 /*
 559  * Set a flag to indicate that a signal from the periodic itimer has been
 560  * caught.
 561  */
 562 static sig_atomic_t signalled;
 563 static void
 564 catchalarm(int signo __unused)
 565 {
 566         signalled = true;
 567 }
 568
 569 /*
 570  * Print a running summary of interface statistics.
 571  * Repeat display every interval seconds, showing statistics
 572  * collected over that interval.  Assumes that interval is non-zero.
 573  * First line printed at top of screen is always cumulative.
 574  */
 575 static void
 576 sidewaysintpr(void)
 577 {
 578         struct iftot ift[2], *new, *old;
 579         struct itimerval interval_it;
 580         int oldmask, line;
 581
 582         new = &ift[0];
 583         old = &ift[1];
 584         fill_iftot(old);
 585
 586         (void)signal(SIGALRM, catchalarm);
 587         signalled = false;
 588         interval_it.it_interval.tv_sec = interval;
 589         interval_it.it_interval.tv_usec = 0;
 590         interval_it.it_value = interval_it.it_interval;
 591         setitimer(ITIMER_REAL, &interval_it, NULL);
 592         xo_open_list("interface-statistics");
 593
 594 banner:
 595         xo_emit("{T:/%17s} {T:/%14s} {T:/%16s}\n", "input",
 596             interface != NULL ? interface : "(Total)", "output");
 597         xo_emit("{T:/%10s} {T:/%5s} {T:/%5s} {T:/%10s} {T:/%10s} {T:/%5s} "
 598             "{T:/%10s} {T:/%5s}",
 599             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 600             "colls");
 601         if (dflag)
 602                 xo_emit(" {T:/%5.5s}", "drops");
 603         xo_emit("\n");
 604         xo_flush();
 605         line = 0;
 606
 607 loop:
 608         if ((noutputs != 0) && (--noutputs == 0)) {
 609                 xo_close_list("interface-statistics");
 610                 return;
 611         }
 612         oldmask = sigblock(sigmask(SIGALRM));
 613         while (!signalled)
 614                 sigpause(0);
 615         signalled = false;
 616         sigsetmask(oldmask);
 617         line++;
 618
 619         fill_iftot(new);
 620
 621         xo_open_instance("stats");
 622         show_stat("lu", 10, "received-packets",
 623             new->ift_ip - old->ift_ip, 1, 1);
 624         show_stat("lu", 5, "received-errors",
 625             new->ift_ie - old->ift_ie, 1, 1);
 626         show_stat("lu", 5, "dropped-packets",
 627             new->ift_id - old->ift_id, 1, 1);
 628         show_stat("lu", 10, "received-bytes",
 629             new->ift_ib - old->ift_ib, 1, 0);
 630         show_stat("lu", 10, "sent-packets",
 631             new->ift_op - old->ift_op, 1, 1);
 632         show_stat("lu", 5, "send-errors",
 633             new->ift_oe - old->ift_oe, 1, 1);
 634         show_stat("lu", 10, "sent-bytes",
 635             new->ift_ob - old->ift_ob, 1, 0);
 636         show_stat("NRSlu", 5, "collisions",
 637             new->ift_co - old->ift_co, 1, 1);
 638         if (dflag)
 639                 show_stat("LSlu", 5, "dropped-packets",
 640                     new->ift_od - old->ift_od, 1, 1);
 641         xo_close_instance("stats");
 642         xo_emit("\n");
 643         xo_flush();
 644
 645         if (new == &ift[0]) {
 646                 new = &ift[1];
 647                 old = &ift[0];
 648         } else {
 649                 new = &ift[0];
 650                 old = &ift[1];
 651         }
 652
 653         if (line == 21)
 654                 goto banner;
 655         else
 656                 goto loop;
 657
 658         /* NOTREACHED */
 659 }